Stud-extracting and thread-cutting device



Nov. 4 1924. v l W. WHELAN STUD EXTRACTING AND THREAD CUTTING DEVICE l Y Filed June 6, 192] CII Patented Novo 4l,

WILLIAM' IN'HELA'JI; QF

PLYMOUTH, ENGLAND.

STUD-EXTEACTENG ND Tl'dREAB-CUTIING DEVICE.

Application :filed June G,

To all @1J/wm t may concern.

Be it known that I, liTiLLL-xir VHELAN, a subject ot the Kingdom ot Great Britain, residing at 2 Moor View, lilutley, Plymouth, England, have inventedy certain new and usetul Improvements in Stud-.Extracting and Thread-Cutting Devices ot which the following is a spec-iiication.

This invention relates to a new or improved engineers tool or device for extracting and inserting screw threaded stud bolts of the kind which are used in boilers for securing the covered plates and which is applicable where screw threaded studs are used for any bolting-down purposes.

According to the present invent-ion the tool or device involves a tubular or hollow body part having an internal tapering cavity wherein a tapering split die or sleeve internally tapped is adapted tol ope-rate and a nut or like member having a left-hand screw connect-ion with the body part is adapted to bear against the die or sleeve tor causing same to be contracted by the oo-acting tapering face to grip a screwed stud engaged with the said die or sleeve for the extraction or insertion of the said stud. By the reverse rotation of the nut or like member the stud may be released from the sleeve or die. A feature of the present invention consists in the means or provision tor cutting or extending a screw thread upon a stud prior to its extraction in cases where same is necessary or desirable.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended explanatory sheet of drawings, upon which z- Figure l is an elevation of a tool constructed according to the present invention.

Figure 2 is a vertical section through the tool shown in Figure l.

Figure 3 is also a vertical section through the tool illustrating same in use upon a stud.

Figure 4 is a horizontal sect-ion on line a a, of Figure 3 and Figure 5 illustrates in perspective the tapering split die or sleeve involved in the present invention.

In a convenient embodiment of the present invention the body part 1 of the device is of hollow cylindrical or tubular formation open at its extremities. Provided internally within this body ypart is a tapering bore or cavity 2 and within this tapering i921. serial ne. 475,473.

bore or cavity are three. tour or other suitable number ot keys 3 disposed aga-inst the tace ot the cavity. rlhese keys may be formed from stout wire or circular section metal vwhich may be. accommodated in grooves in the face of the tapering cavity. Adapted to operate within this tapering cavity is the contractile die or sleeve 4. This member illustrated particularly in Figure 5, is double truste-conical forni Yand is'split longitudinally at The lower part 6 of the external annular tace is of tapering torniation to correspond with the tapering cavity 2 and three, tour or other suitable number oi' grooves 'l' are provided longitudinally upon the vexternal face'of the die or sleeve to cooperate with the aforementioned keys 3. Internally this die or sleeve 4 is tapped with a right-hand screw thread and the arrangement is such that when the said die or sleeve is disposed within its cavity 2 the upper part projects into an upper open space S of the body part. A screw member 9 having a left-hand screw thread 10 is adapted to cooperate with av corresponding screw thread provided laterally in the upper mouth or upper open part ot the body part and this screw 9 can be brought to bear upon the upper projecting part of the die or sleeve 4 to force same downwardly into the tapering cavity 2 and cause the said die or sleeve to be contracted on to the stud 1l tor eliiciently gripping same as shown in Figure 3. The screw or like member 9 may be bored concentrically at l2 to permit of the passage ot a long projecting stud l1 through same. A hexagonal formation 13 adjacent the bottom or lower part thereof is provided externally upon the body part and the arrangement is such that when the sleeve or die 4 is in position in the body part the lower extremity of said sleeve member or die lies normally adjacent or not far removed from the bottom or lower part of the body part or device, as shown in Figure 2. The screw or like member Qmay be recessed at 14 for the reception ot the upper part of the die or sleeve 4.

In operation the device complete with the sleeve or die 4 and screw 9 screwed loosely against same by the hand as shown in Figures l and 2 is screwed onto the stud to be removed for the desired distance and the screw 9 is then tightened by its left-hand screw thread and the body part 1 held. The body part is then released and the conthe stud. The screw 9 may be readily unscrewed by holding the body part .f2 by means of its hexagonal or equivalent torination'lf. An important feature of the present invention consists in the fact that the present device may be employed for cutting or extending the thread upon a stud prior to its extraction. ln order to effect this the screw 9 may be screwed heine in relation te the body part with moderate pressure and the body part l rotated upon the stud to cause .the die or sleeve to continue or extend the screw thread on the stud on account of its split construction7 and so enable a more eflicient grip to be obtained of the said stud in the case of a very short projecting stud. The eXtreme lower end of the sleeve or die may be internally slotted at positions around its circumference as shown by the numeral l5 Figure 2 to assist in the screw cutting operation. The tool may be supplied or sold The operation re! with three or other suitable number olf dies each of which has a different internal aperture for engaging di'erent sized studs but externally said dies are each adapted 'for use with the same body part l.

What l claim as my invention and desire to secure by Letters Patent is A screw stud extracting and ythread cub ting device comprising a bony having a tapered bore extending te one end7 a resily ient diametrically expansiblesleeve slidabljy` keyed in said body, having a tapered portion toengage in said bore, and open at one side from end to end9 vsaid sleeve being` further provided with an internal stridireceir ing screw thread, and a screw having threaded engagement with the other end oi' said body and arranged to bear and rotate on the inner end of said sleeve7 the threaded connection between the screw and the body being reverse to the internal thread of the sleeve.

ln witness whereof l have hereunto set my hand in the presence of two witnesses.v

WILLIAM HELAN. Vfitnessesz' ARTHUR H. BROWN, EDGAR N. lWHEELER` 

